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-18-9u=2-8u
We move all terms to the left:
-18-9u-(2-8u)=0
We add all the numbers together, and all the variables
-9u-(-8u+2)-18=0
We get rid of parentheses
-9u+8u-2-18=0
We add all the numbers together, and all the variables
-1u-20=0
We move all terms containing u to the left, all other terms to the right
-u=20
u=20/-1
u=-20
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